What province did you live in on December 31

For tax purposes, you file a return based on the province or territory you live in or are considered a factual resident of as on December 31. The Canada Revenue Agency (CRA) (and Revenu Québec, if applicable), uses this information to calculate your and your spouse's or common-law partner's (if applicable) provincial taxes and credits. The provincial amounts applicable to your situation are calculated based on your province help you get the maximum credits available to you.